Wheel names do not conform to current PyPA standards #68
Description
The names of wheels (generated by sip-wheel and from sdists created by sip-module) do not conform to current PyPA standards resulting in deprecation warnings when uploading to PyPI. The issue is that the file names can contain upper case characters. The name of the .dist-info directory within the wheel should also be lower case.
As well as fixing sip-wheel etc., the minimum setuptools version should be v75.8.1 (which is the first version that fixes the same bug).